| Measuring placental transfusion for term births: weighing babies with cord intact. | |
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MedLine Citation:
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PMID: 21083868 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: To estimate the volume and duration of placental transfusion at term. DESIGN: Prospective observational study. SETTING: Maternity unit in Bradford, UK. POPULATION: Twenty-six term births. METHODS: Babies were weighed with umbilical cord intact using digital scales that record an average weight every 2 seconds. Placental transfusion was calculated from the change in weight between birth and either cord clamping or when weighing stopped. Start and end weights were estimated using both a B-spline and inspection of graphs. Weight was converted to volume, 1 ml of blood weighing 1.05 g. MAIN OUTCOME MEASURES: Volume and duration of placental transfusion. RESULTS: Twenty-six babies were weighed. Start weights were difficult to determine because of artefacts in the data as the baby was placed on the scales and wrapped. The mean difference in weight was 116 g [95% confidence interval (CI), 72-160 g] using the B-spline and 87 g (95% CI, 64-110 g) using inspection. Converting this to the mean volume of placental transfusion gave 110 ml (95% CI, 69-152 ml) and 83 ml (95% CI, 61-106 ml), respectively. Placental transfusion was usually complete by 2 minutes, but sometimes continued for up to 5 minutes. Based on the B-spline, placental transfusion contributed 32 ml (95% CI, 30-33 ml) per kilogram of birth weight to blood volume, but 24 ml (95% CI, 19-32 ml) based on inspection. This equates to 40% (95% CI, 37-42%) and 30% (24-40%), respectively, of total potential blood volume. CONCLUSION: Inspection of the graphs probably underestimates placental transfusion. For term infants, placental transfusion contributes between one-third and one-quarter of total potential blood volume at birth. |
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Authors:
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D Farrar; R Airey; G R Law; D Tuffnell; B Cattle; L Duley |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-11-18 |
Journal Detail:
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Title: BJOG : an international journal of obstetrics and gynaecology Volume: 118 ISSN: 1471-0528 ISO Abbreviation: BJOG Publication Date: 2011 Jan |
Date Detail:
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Created Date: 2010-12-14 Completed Date: 2011-02-02 Revised Date: 2011-05-25 |
Medline Journal Info:
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Nlm Unique ID: 100935741 Medline TA: BJOG Country: England |
Other Details:
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Languages: eng Pagination: 70-5 Citation Subset: AIM; IM |
Copyright Information:
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© 2010 The Authors Journal compilation © RCOG 2010 BJOG An International Journal of Obstetrics and Gynaecology. |
Affiliation:
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Bradford Institute for Health Research, Bradford Royal Infirmary, Bradford, UK. diane.farrar@bradfordhospitals.nhs.uk |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Birth Weight
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physiology* Blood Volume / physiology Cesarean Section Constriction Delivery, Obstetric Female Humans Labor Stage, First / physiology Placenta / blood supply* Pregnancy Prospective Studies Term Birth / physiology* Time Factors |
| Comments/Corrections | |
Comment In:
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BJOG. 2011 May;118(6):767; author reply 767-7
[PMID:
21481142
]
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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